1. Basu, A.K. and Leclerc, E. (1972), Adv. Wat. Pollut. Res.6, 581.
2. Braun, R. and Huss, S. (1981), Dept. Applied Micro., Univ. Aar. Forestry, Vienna, Austria.
3. Cail, R.G. and Barford, J.P. (1983a) Biotechnol. Lett. (in preparation).
4. Cail, R.G. and Barford, J.P. (1983b) Biotechnol . Lett. (in preparation).
5. Callander, I.J. (1983), Ph.D. Thesis, University of Sydney.